The dichroic adds such sparkle and depth to the bead which is very difficult for photography. Each bead is completely unique as the application method and dichroic achieve a different result in each bead. The size is approximately 18mm disc, lentil with a base of black Moretti Glass and a 1mm hole running through the center. They are exquisite. A dichroic filter or thin-film filter is a very accurate color filter used to selectively pass light of a small range of colors while reflecting other colors (from Wikipedia) Dichroic Beads are a great way to upscale your Murano Glass Jewelry. The dichroic color is our Magento Black.